One of the most common practices amongst today’s software developers is to leave certain kind of “backdoors” within operating systems. These “backdoors” essentially allow any users with sufficient knowledge to get into the system at a much deeper level than you’d expect from normal users. These backdoors aren’t always meant to be used for malicious intent, as they allow programmers to get into the system for troubleshooting when other usual access modes have been blocked. And to developers, they can be quite friendly and helpful if you know what you’re doing. In smartphones these backdoor are called “secret codes”.

IMPORTANT! Some manufacturers do not allow the use of these codes and they may not work on your device. By using secret codes you can modify certain parameters of your device. Use at your own risk!